summaryrefslogtreecommitdiff
path: root/lib/strtol.c
blob: 1d920aff5441d44344a5c5e735b1e973993227cb (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
348
349
350
351
352
353
354
355
356
357
358
359
360
361
362
363
364
365
366
367
368
369
370
371
372
373
374
375
376
377
378
379
380
381
382
383
384
385
386
387
388
389
390
391
392
393
/* Convert string representation of a number into an integer value.

   Copyright (C) 1991-1992, 1994-1999, 2003, 2005-2007, 2009-2019 Free Software
   Foundation, Inc.

   NOTE: The canonical source of this file is maintained with the GNU C
   Library.  Bugs can be reported to bug-glibc@gnu.org.

   This program is free software: you can redistribute it and/or modify it
   under the terms of the GNU General Public License as published by the
   Free Software Foundation; either version 3 of the License, or any
   later version.

   This program is distributed in the hope that it will be useful,
   but WITHOUT ANY WARRANTY; without even the implied warranty of
   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
   GNU General Public License for more details.

   You should have received a copy of the GNU General Public License
   along with this program.  If not, see <https://www.gnu.org/licenses/>.  */

#ifdef _LIBC
# define USE_NUMBER_GROUPING
#else
# include <config.h>
#endif

#include <ctype.h>
#include <errno.h>
#ifndef __set_errno
# define __set_errno(Val) errno = (Val)
#endif

#include <limits.h>
#include <stddef.h>
#include <stdlib.h>
#include <string.h>

#ifdef USE_NUMBER_GROUPING
# include "../locale/localeinfo.h"
#endif

/* Nonzero if we are defining 'strtoul' or 'strtoull', operating on
   unsigned integers.  */
#ifndef UNSIGNED
# define UNSIGNED 0
# define INT LONG int
#else
# define INT unsigned LONG int
#endif

/* Determine the name.  */
#ifdef USE_IN_EXTENDED_LOCALE_MODEL
# if UNSIGNED
#  ifdef USE_WIDE_CHAR
#   ifdef QUAD
#    define strtol __wcstoull_l
#   else
#    define strtol __wcstoul_l
#   endif
#  else
#   ifdef QUAD
#    define strtol __strtoull_l
#   else
#    define strtol __strtoul_l
#   endif
#  endif
# else
#  ifdef USE_WIDE_CHAR
#   ifdef QUAD
#    define strtol __wcstoll_l
#   else
#    define strtol __wcstol_l
#   endif
#  else
#   ifdef QUAD
#    define strtol __strtoll_l
#   else
#    define strtol __strtol_l
#   endif
#  endif
# endif
#else
# if UNSIGNED
#  ifdef USE_WIDE_CHAR
#   ifdef QUAD
#    define strtol wcstoull
#   else
#    define strtol wcstoul
#   endif
#  else
#   ifdef QUAD
#    define strtol strtoull
#   else
#    define strtol strtoul
#   endif
#  endif
# else
#  ifdef USE_WIDE_CHAR
#   ifdef QUAD
#    define strtol wcstoll
#   else
#    define strtol wcstol
#   endif
#  else
#   ifdef QUAD
#    define strtol strtoll
#   endif
#  endif
# endif
#endif

/* If QUAD is defined, we are defining 'strtoll' or 'strtoull',
   operating on 'long long int's.  */
#ifdef QUAD
# define LONG long long
# define STRTOL_LONG_MIN LLONG_MIN
# define STRTOL_LONG_MAX LLONG_MAX
# define STRTOL_ULONG_MAX ULLONG_MAX
# if __GNUC__ == 2 && __GNUC_MINOR__ < 7
   /* Work around gcc bug with using this constant.  */
   static const unsigned long long int maxquad = ULLONG_MAX;
#  undef STRTOL_ULONG_MAX
#  define STRTOL_ULONG_MAX maxquad
# endif
#else
# define LONG long
# define STRTOL_LONG_MIN LONG_MIN
# define STRTOL_LONG_MAX LONG_MAX
# define STRTOL_ULONG_MAX ULONG_MAX
#endif


/* We use this code also for the extended locale handling where the
   function gets as an additional argument the locale which has to be
   used.  To access the values we have to redefine the _NL_CURRENT
   macro.  */
#ifdef USE_IN_EXTENDED_LOCALE_MODEL
# undef _NL_CURRENT
# define _NL_CURRENT(category, item) \
  (current->values[_NL_ITEM_INDEX (item)].string)
# define LOCALE_PARAM , loc
# define LOCALE_PARAM_PROTO , __locale_t loc
#else
# define LOCALE_PARAM
# define LOCALE_PARAM_PROTO
#endif

#ifdef USE_WIDE_CHAR
# include <wchar.h>
# include <wctype.h>
# define L_(Ch) L##Ch
# define UCHAR_TYPE wint_t
# define STRING_TYPE wchar_t
# ifdef USE_IN_EXTENDED_LOCALE_MODEL
#  define ISSPACE(Ch) __iswspace_l ((Ch), loc)
#  define ISALPHA(Ch) __iswalpha_l ((Ch), loc)
#  define TOUPPER(Ch) __towupper_l ((Ch), loc)
# else
#  define ISSPACE(Ch) iswspace (Ch)
#  define ISALPHA(Ch) iswalpha (Ch)
#  define TOUPPER(Ch) towupper (Ch)
# endif
#else
# define L_(Ch) Ch
# define UCHAR_TYPE unsigned char
# define STRING_TYPE char
# ifdef USE_IN_EXTENDED_LOCALE_MODEL
#  define ISSPACE(Ch) __isspace_l ((Ch), loc)
#  define ISALPHA(Ch) __isalpha_l ((Ch), loc)
#  define TOUPPER(Ch) __toupper_l ((Ch), loc)
# else
#  define ISSPACE(Ch) isspace (Ch)
#  define ISALPHA(Ch) isalpha (Ch)
#  define TOUPPER(Ch) toupper (Ch)
# endif
#endif

#define INTERNAL(X) INTERNAL1(X)
#define INTERNAL1(X) __##X##_internal
#define WEAKNAME(X) WEAKNAME1(X)

#ifdef USE_NUMBER_GROUPING
/* This file defines a function to check for correct grouping.  */
# include "grouping.h"
#endif



/* Convert NPTR to an 'unsigned long int' or 'long int' in base BASE.
   If BASE is 0 the base is determined by the presence of a leading
   zero, indicating octal or a leading "0x" or "0X", indicating hexadecimal.
   If BASE is < 2 or > 36, it is reset to 10.
   If ENDPTR is not NULL, a pointer to the character after the last
   one converted is stored in *ENDPTR.  */

INT
INTERNAL (strtol) (const STRING_TYPE *nptr, STRING_TYPE **endptr,
                   int base, int group LOCALE_PARAM_PROTO)
{
  int negative;
  register unsigned LONG int cutoff;
  register unsigned int cutlim;
  register unsigned LONG int i;
  register const STRING_TYPE *s;
  register UCHAR_TYPE c;
  const STRING_TYPE *save, *end;
  int overflow;

#ifdef USE_NUMBER_GROUPING
# ifdef USE_IN_EXTENDED_LOCALE_MODEL
  struct locale_data *current = loc->__locales[LC_NUMERIC];
# endif
  /* The thousands character of the current locale.  */
  wchar_t thousands = L'\0';
  /* The numeric grouping specification of the current locale,
     in the format described in <locale.h>.  */
  const char *grouping;

  if (group)
    {
      grouping = _NL_CURRENT (LC_NUMERIC, GROUPING);
      if (*grouping <= 0 || *grouping == CHAR_MAX)
        grouping = NULL;
      else
        {
          /* Figure out the thousands separator character.  */
# if defined _LIBC || defined _HAVE_BTOWC
          thousands = __btowc (*_NL_CURRENT (LC_NUMERIC, THOUSANDS_SEP));
          if (thousands == WEOF)
            thousands = L'\0';
# endif
          if (thousands == L'\0')
            grouping = NULL;
        }
    }
  else
    grouping = NULL;
#endif

  if (base < 0 || base == 1 || base > 36)
    {
      __set_errno (EINVAL);
      return 0;
    }

  save = s = nptr;

  /* Skip white space.  */
  while (ISSPACE (*s))
    ++s;
  if (*s == L_('\0'))
    goto noconv;

  /* Check for a sign.  */
  if (*s == L_('-'))
    {
      negative = 1;
      ++s;
    }
  else if (*s == L_('+'))
    {
      negative = 0;
      ++s;
    }
  else
    negative = 0;

  /* Recognize number prefix and if BASE is zero, figure it out ourselves.  */
  if (*s == L_('0'))
    {
      if ((base == 0 || base == 16) && TOUPPER (s[1]) == L_('X'))
        {
          s += 2;
          base = 16;
        }
      else if (base == 0)
        base = 8;
    }
  else if (base == 0)
    base = 10;

  /* Save the pointer so we can check later if anything happened.  */
  save = s;

#ifdef USE_NUMBER_GROUPING
  if (group)
    {
      /* Find the end of the digit string and check its grouping.  */
      end = s;
      for (c = *end; c != L_('\0'); c = *++end)
        if ((wchar_t) c != thousands
            && ((wchar_t) c < L_('0') || (wchar_t) c > L_('9'))
            && (!ISALPHA (c) || (int) (TOUPPER (c) - L_('A') + 10) >= base))
          break;
      if (*s == thousands)
        end = s;
      else
        end = correctly_grouped_prefix (s, end, thousands, grouping);
    }
  else
#endif
    end = NULL;

  cutoff = STRTOL_ULONG_MAX / (unsigned LONG int) base;
  cutlim = STRTOL_ULONG_MAX % (unsigned LONG int) base;

  overflow = 0;
  i = 0;
  for (c = *s; c != L_('\0'); c = *++s)
    {
      if (s == end)
        break;
      if (c >= L_('0') && c <= L_('9'))
        c -= L_('0');
      else if (ISALPHA (c))
        c = TOUPPER (c) - L_('A') + 10;
      else
        break;
      if ((int) c >= base)
        break;
      /* Check for overflow.  */
      if (i > cutoff || (i == cutoff && c > cutlim))
        overflow = 1;
      else
        {
          i *= (unsigned LONG int) base;
          i += c;
        }
    }

  /* Check if anything actually happened.  */
  if (s == save)
    goto noconv;

  /* Store in ENDPTR the address of one character
     past the last character we converted.  */
  if (endptr != NULL)
    *endptr = (STRING_TYPE *) s;

#if !UNSIGNED
  /* Check for a value that is within the range of
     'unsigned LONG int', but outside the range of 'LONG int'.  */
  if (overflow == 0
      && i > (negative
              ? -((unsigned LONG int) (STRTOL_LONG_MIN + 1)) + 1
              : (unsigned LONG int) STRTOL_LONG_MAX))
    overflow = 1;
#endif

  if (overflow)
    {
      __set_errno (ERANGE);
#if UNSIGNED
      return STRTOL_ULONG_MAX;
#else
      return negative ? STRTOL_LONG_MIN : STRTOL_LONG_MAX;
#endif
    }

  /* Return the result of the appropriate sign.  */
  return negative ? -i : i;

noconv:
  /* We must handle a special case here: the base is 0 or 16 and the
     first two characters are '0' and 'x', but the rest are no
     hexadecimal digits.  This is no error case.  We return 0 and
     ENDPTR points to the 'x'.  */
  if (endptr != NULL)
    {
      if (save - nptr >= 2 && TOUPPER (save[-1]) == L_('X')
          && save[-2] == L_('0'))
        *endptr = (STRING_TYPE *) &save[-1];
      else
        /*  There was no number to convert.  */
        *endptr = (STRING_TYPE *) nptr;
    }

  return 0L;
}

/* External user entry point.  */


INT
#ifdef weak_function
weak_function
#endif
strtol (const STRING_TYPE *nptr, STRING_TYPE **endptr,
        int base LOCALE_PARAM_PROTO)
{
  return INTERNAL (strtol) (nptr, endptr, base, 0 LOCALE_PARAM);
}